Fabric Crayons Crayola 8 count. Fabric Crayons turn crayon drawings into colorful fabric art. Simply draw with these special formula crayons on paper. Then, iron them onto fabric for brilliant, permanent fabric designs. They work best on white fabric and synthetic blends. Product Dimensions (inches): 4 (Length) x 3 (Width) x 0.5 (Height). Age: 4 years and up.